"""
大文件复制
"""
# 大文件复制
source = open("README", 'r')
target = open("COPY_BIG", "w")
# 循环读取文件内容
while True:
    text = source.readline()
    if not text:
        break
    target.write(text)

# 关闭文件
source.close()
target.close()
